Let-off mechanism for narrow-ware looms.



J. G. GAYNOR. LET-OFF MEGHANISMIOR NARROW WARE LOOMS.

APPLIGATION FILED MAY 25, 1909.

Patented Dec. 21; 1909.

Z SHEETS-SHEET 1.

J. G. GAYNOR. LET-OFF MECHANISM FOR NARROW WARE LooMs.

APPLIGATIOR FILED MAY 25. 1909.

Patented Dec. 21, 1909. ZSHEETS-SHEET 2.

[mower munsw. a GRINAM 0a.. Fuonxumu WITNESSES GRAPIER IINITFAD STATES PATENT @FFIQE.

JAMES C. GAYNOE, 0E PGMPTON, NEW JERSEY, ASSIGNOR OF ONE-HALF TO A.

KLUGE, OF EGMPTON, NEW JERSEY.-

LET-OFF MECHANISM FGR NARRON-WARE LOOlVIS.

To all whom it may concern:

Be it known that I, JAMES C. GAYNOR, a citizen of the United States, residing in Pompton, Passaic county, and State of New Jersey, have invented a certain new and useful Improvement in Let-Off Mechanisms for Narrow-WVare Looms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this specification.

This invention relates to looms, and particularly to the let-ofi mechanism thereof.

My object is to provide a let-off mechan sm wiich will preserve an even tension on the warps under changing conditions, as when the mechanism is variously weighted or otherwise similarly adjusted to suit the character of the warp being used, and which will afford clear access both to the warp and to the beam, particularly when a number of such mechanisms are employed together, as is commonly the case in narrow-ware looms.

In view of the foregoing, my invention consists in providing a means for opposing a warp-controlled res stance to the rotation of the beam, the same comprising two cooperative warp-engaged lever-structures one of which is fulcrumed in the support, in combination with a weight-lever also fulcrumed in the support and normally holding said means in rotation-resisting relation to the beam.

In the accompanying drawings I have fully illustrated my invention.

Figure 1 is a view in side elevation of two let-off mechanism for looms, and of a part of the loom frame, the latter be ng shown partly in dotted outline and partly in section; Fig. 2. is a plan view of the lower letofi mechanism in Fig. 1, showing the stands thereon in horizontal section; and, Figs. 3 and 4 illustrate details.

a designates the loom frame and b one of the horizontal shafts forming a part thereof.

0 designates a suitable support comprising stands suitably arranged in the frame a and in the present instance resting on the shaft (2 and formed with open bearings (Z for the trunnions e of the beams f, the same having Specification of Letters Patent.

Application filed May 25, 1909.

Patented Dec. 21, 1909.

Serial No. 498,276.

their flanges peripherally grooved, as at g, in the usual manner.

In Fig. l, the lower tension mechan sm there shown is appropriated to the ground warp; the upper mechanism may be also appropriated to a ground or other warp, such as a face warp, edge-warp, etc. Both mechanisms are in the present instance alike, so a description of one will serve for the other.

In the stands 0 is fulcrumed a lever-structure 72. having a substantially U-shaped form, the base of the U being at the rear end thereof; the pivots i of this lever-structure are disposed between its ends, preferably midway; in its outer end is shown the usual roller 7' under which warp A extends. In this lever-structure is fulcrumed another lever-structure 7a. This comprises two side members Z each having its rear end turned up and its forward end turned down, and a cross-piece m integrally connect ng the side members Z and formed near its ends with the holes a. The downwardly projecting end of each member Z receives the pivot 0 for the lever-structure 7c and bears prefer ably against the outside face of the leverstructure it, the remainder of member Z being disposed above the corresponding side of lever-structure h and lying in substantially the same plane, so that a downwardly projecting lug 7? on member Z may contact with lever-structure h in the movement of one lever structure toward the other.

A brake-band. q is extended around each flange of the beam f, lying in the groove 9 thereof; each brake band is at one end adjustably fixed, as at r, to one of the stands 0 and at the other end carries a hook s which is passed through the hole a in the crosspiece 477. of the lever-structure is. In the upwardly projecting ends of lever-structure 7c is ournaled a roller 6 over which the warp passes on its way from the under side of the beam f to roller j. In the stands 0 is also fulcrumed the Weight-lever M. This comprises a U-shaped portion '0 and a forwardly projecting arm to. The fulcrum of this lever is afforded by two pivots a and back of each pivot each leg of the U-shaped portion '0 is pivotally connected with thecorresponding leg or side of lever-structure h by a link 3 The arm-portion w of lever u is notched along its upper edge, as at z, and these notches are adapted to receive a pin 1 which traverses the slot of a weight 2 adapted to straddle the arm to. To insure against the weight being jarred from the arm when lever u is a'llowedto fall, the notchesz have restricted entrances, as shown.

In use, the mechanism operates substantially as follows: The tendency of the weight of lever-structure 7c is to exert a tension on the brake bands 9 so that the latter act to resist frictionally the rotation of the beam f, the resistance thus occasioned being dependent upon the elevating action of the warp with respect to the lever-structures h and in, upward movement of the former acting, as will be obvious, to raise the latter and hence reduce the tension on the brake bands. By providing the Weight-lever u, having the ad justable weight 2, and connecting said weight-lever with the lever-structure h in the manner stated, I make the resistance offered by the brake bands 9 more even and regular in nature than it would otherwise be and at the same time make it possible to vary such resistance to suit the nature of the Warp being used, with the result that under practically any conditions a uniform tension may be exerted on the warp.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a let-01f mechanism for looms, the combination of a support, a Warp-beam journaled in said support, means for opposing a warp-controlled resistance to the rotation of the warp-beam comprising two coiiperative warp-engaged lever-structures, one of which is fulcrumed in the support, and a weight-lever also fulcrumed in the support and normally holding said means in rotation-resisting relation to the warp-beam substantially as described.

2. In a let-off mechanism for looms, the combination of a support, a warp-beam journaled in said support, means for opposing a warpcontrolled resistance to the rotation of the warp-beam comprising two cooperative warp-engaged lever-structures, one of which is fulcrumed in the support between its ends and is engageable with the other at one side of its fulcrum, and a Weight-lever fulcrumed in said support and operatively connected to the first-named lever-structure at the other side of its fulcrum, substantially as described.

In a let-ofi mechanism for looms, the combination of a support, a warp-beam journaled in said support, a warp-engaged leverstructure fulcrumed in said support, means for exerting a braking influence upon the warp-beam comprising another warp-engaged lever-structure fulcrumed in the firstnamed lever-structure at one side of the fulcrum thereof and extending over and adapted to contact with the first-named leverstructure, and a weight-lever also fulcrumed in the support and operatively connected with the first-named lever-structure at the other side of the fulcrum thereof, substan tially as described.

st. In a let-off mecl1anism for looms, the combination of a support, a Warp-beam ournaled in the support, cooperative leverstructures, one of which is fulcrumed in the support, a braking device operatively con- 1 nected to one of said lever structures, a weight-lever also fulcrumed in the support l and operatively connected to the latter lever- I structure, and an adjustable weight arranged on said weight-lever, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 22nd day i of May, 1909. I JAMES C. GAYNOR.

Witnesses JOHN IV. STEWARD,

IVM. D. BELL. 

